SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17f666f7a5d939130e3219b66c1da5be632a4372535842a9467408caf817dfe4' 
  AND token = '5zinT/0VjQ+g/iEMCdot0lxf4Zj5/G/5Kj3ilgwpntU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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