SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30bcf3df58460b95cdb702d08bb58d744f4cf181d1ae5b76a969e4bb40679fb4' 
  AND token = 'GiR8NKGtzDKlBwJ4AYwzW3s/RPYvBIyMxUl/hfpmTaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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