SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f8d354d5ce25eb924d2d0685f3064c67d0174a127a8765a56b421ebf4e303dd' 
  AND token = 'qGfQ++YuVAtrmiFgf89UohnsXh0VR9KUMKoczjZEW3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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