[keycloak-user] have keycloak validate a SAML uid / token combination

Hi, Is it possible to configure keycloak to validate SAML obtained uid / token? I have an application authenticate via SAML on keycloak. The result is an authenticated user with a uid and a token. (log string of characters) Can I, in a different process, check with keycloak that this uid/token is still a valid combination? What kind of client (if any) would I have to configure in keycloak to do this? MJ