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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf7ace145835fcb78df0d349ccc03d2a6a9c7bbd2a1f6c3ae116b6d53fd19e56' 
  AND token = '8xAb35wNgynH0XVSVevYBwPl5kfnQndmyNHqeI+a9jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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