SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf58eb2804ae79184b1eb7f4f7fa81032478bc1d7ae1186f84e17acc53bd63d5' 
  AND token = 'jzBU7WhoXkTigtQN/dPb/wfwZUhVuugyqUmCG6tD01s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}