Don't worry about it. The cats and snakes don't interact whatsoever, they're kept separate, and the snakes have been here long before the cats arrived so the cats have grown up and been raised to keep away from the terrariums. They're well-trained and respect that the terrariums are a no-go zone and the terrariums have locks on them and we check them often to make sure nothing is malfunctioning.

(And, just because this isn't the first time we've encountered this concern, the snakes don't see the cats as food and we don't have snakes big enough to eat cats. The snakes eat mice or large to extra-large rats and none of our cats are that small so there's no feline for dinner for anyone)