SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c838905fa13a012fa1cf3643894fa18676c32c9610d3e866887810f74eec7d2' 
  AND token = 'S0eAG+8X40ZhXvYiddLBYJ5+R0n3c0g9v+GUlMaAv68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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