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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd1720d63539098d77a1b17567bfc48baaf13f7f845a89276fd5819fe6c7418' 
  AND token = 'jXiSiY0nk8Pp/fXXq79qMmMElcJ9zCHZas5SmHlr09U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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