SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a663835f457ad47bcc9c7feff45b0ce58e3ac7fd278fb076dfa394ee28c36b94' 
  AND token = 'rMaLqijFwUGnkPXkp+6L85xPJYWP8j2xC/0H4BZgkWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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