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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd919a87ee11ebc4b6a87b0187c980a978c0798ad88f6e4684c2d8492842626' 
  AND token = 'cGK9ejju38RoUXCB5iG/uiZ3xMYtuEMZU4Oe3sI9Y8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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