Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff6f00d51981379e49e027df8384fb2015d6e4772bdfcadfd61e8ae12a4b59b2' 
  AND token = 'hDoFzWnBU3Z6zWxcSJeLrQk7Sxc4Fufo7MGmAunLT2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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