SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f8d7842c94a2be2bcc9c0dff611553f457e706b2fe72978e992108be524b089' 
  AND token = 'JrTB8mJIuR3txYl2WNJwEh+XHovRA6IfmusJljETrV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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