Cookies with a constantly changing key. Is it worth it?

Question

PHP

With each request, a random key is created, saved and sent to the user, a new request, we check with the old one, we create a new one ... and so on ad infinitum. But the question arose, if the connection is lost, then the keys will be different, is this a normal way? If the connection is interrupted... or... or am I paranoid?
PS ip + useragent is also used
Just a way I think is good + if ssl, I wrote the code, but now I'm confused