SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18481576a9a6dab60064e728a8c562034b2c60dd348b79873af7c13d76a6f8d2' 
  AND token = 'PkbTo6WNAqSTCtgoMrWkj+vYip+TtMLXRlRlH6qoS1A=' 
  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