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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f59db512b5c4eb9db7342c58b0e0d617cec5962a4da45b141c5876f85f95b3b0' 
  AND token = 'b3J1LL2W9SAMJuZ9UNU9ddbxG63ag4bK+IWNcMQmhtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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