Must I pay the remaining amount of the shop's rent, knowing that I will vacate it before the end of the two-year contract period?

The remaining duration of the lease is binding upon you, and you must pay the remaining rent, and you have the right to utilize the property. You can agree with the owner to waive the remaining rent if he wishes to vacate the property, or you can sublease it to someone else for the remaining period. It is not permissible for you to unilaterally terminate the contract and refrain from paying the remaining rent, as the lease is a binding contract for both parties.