SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '704b6e931d8795e5edd9015889ebc631d090f64facf2eb51325e27db3ce01a34' 
  AND token = 'i/KpTmPFHF/A69vxYfmrxgu2lpx5EUqL8HhO3IhK+kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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