SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '812e7e18041bae962bdcb99140e9bded786f1034f6869615e464b5b6c8a32bfa' 
  AND token = 'so8YpCH6BAUx9E7gBbS8v/bHvlY1c+Wrt8clcrPUiTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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