SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0431c2ab8622de38fe9f170b47787f2b7819af33d3837ebda50e06dd0ef11b3' 
  AND token = 'KW22zBPYvmTSMqGn+eMyu8OpknUHojc/ZEHx5J6XYc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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