SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5319b1edc1b4781367787ce0f8f487083ff0cef62762369a67d30b6a4378861' 
  AND token = 'SKZJe07xA3hL6u0AMsKv25+metlLGBfSlXYKhUPgqmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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