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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e24170898465cbb1f95e6888dcbb55658f419de5a814068046b42e66ce9f8516' 
  AND token = 'sWCBAb77rnZxEYiTJhDM0PBckvARmeMk6sVziwuxhf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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