Some of these pictures and descriptions may give away plot details that you might not want to know before watching the film.
This is a screwball comedy adventure film that is a lot of fun regardless that it's blatant copy of the Indiana Jones movies, including the exotic locations, the early 20th century setting, and the bombastic fanfare music. It doesn't bother to introduce and explain the characters, assuming that we've already seen "The Mummy." There's a long-winded plot about a resurrected mummy who wants to resurrect the Scorpion King so he can take over his army of giant dog mummies and conquer the world and the army of tattoed-faced Arab horsemen who fight the mummy's army. The main protagonists played by Brendan Fraser and Rachel Weisz have a trouble-making 8-year old son who draws them into the conflict by stealing the Scorpion King's bracelet, along with the fact that Weisz is the reincarnation of an ancient Egyptian Pharoah's daughter Nefertiri.
The first snake appears in a comic scene. Fraser and Weisz are desecrating an ancient Egyptian temple when she hears hissing sounds and looks down to see a snake on the sandy floor. She tells it to go away and kicks it right into Fraser who has just come into the room. He tells her "those are poisonous, you know" and she replies "only if they bite you."
The second snake scene involves a venomous snake used as a weapon. At Fraser's mansion in England, some henchman are holding a knife to Fraser's brother-in-law's throat, trying to make him tell them where he put the Scorpion King's bracelet, which he knows nothing about. A woman named Meela, the incarnation of the fiance and murderer of Nefertiri's Pharoah father, walks onto the scene and pulls a black snake out of a basket telling him "Egyptian asps are quite poisonous" then she kisses the snake. She takes the asp, which is hissing and gaping like all movie snakes, and holds it to the man's throat to kill him (as if the knife to his throat couldn't kill him just as well) but Fraser rushes in and distracts her. Meela throws the snake at Fraser's head to kill him, but he catches the snake and holds it behind the head, surprising her. When Meela tells one of her men to shoot him (why not do that first?) Fraser throws the snake into the henchman's face and he falls over backwards. That's the last we see of that snake.
Later Meela demonstrates her maternal side by threatening to put poisonous snakes in the 8 year-old boy's bed when he's sleeping.
The first snake is a harmless milk snake which is probably replaced with a fake snake when it is kicked towards Fraser. The second snake is a harmless black rat snake that is replaced with a well-made fake snake, complete with a tongue that moves in and out of the mouth, for the close-up shots. I'm going to guess that they used a different fake snake in the snake throwing shots.