SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fcc2845160e3d45f430d9530e54c4a2dc57d75101c08d37da56fe9126ab444e' 
  AND token = 'XkxaElF0PV/V8hrAGuMBHtteQilv1w/Fn3S/atmTG4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

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