Simply put: you can't!
You can look for scratches, or if the record is warped, but nothing more.
Maybe you can judge by the cover if it has been played a lot (original skinwrap vs heavily abused covers...).
But in the end you can't see if the record has been abused or not, you have to play it!
Also bear in mind that sometimes used records only needs to be washed, so if you plan to buy a lot of used vinyls buy a Knosti washing machine (only € 50): the best buy for a 2nd hand vinyl collector!
Good luck and remember: always negotiate