SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e5d7044e0dc3625e87408f93f14de2fb6606db3575c0d5572dfc0234a339522' 
  AND token = '+L795xEccx4TRqjIl0Fsv3e1wR0cEb+QG2tJ7dgawV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables