Losing your car keys is a disaster, and it will cost you a lot of money to have an auto locksmith come out and help you. That is why it is a wise idea to make a copy of your car keys as soon as you can, and make it from the original key too, to ensure that it will work.
Do not forget to test the key as soon as you get it too, otherwise you might just be stuck with a faulty key. Keep this key in a safe place outside your car, like in your home on a specific place, so that you never have to look for it.