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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '399d69758e1995b4efc818b1e3ffec6ea17bb020cb6095d9e9b8957bbb34757e' 
  AND token = '4eL7+rqQolXDV1V7nRaf+59QMuKxustt8z4B4ETVZX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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