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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdecd5b85dae701876bf9b2293a742663e2765616096b35dbf9c5974397d9ca4' 
  AND token = 'Hi8Z4YPVKy7OdBcnP8vMBoiKg8dNsO4yreC85fjOhcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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