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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8266a223b97cd17d5db8346fe90eec157ccc0b850ae841e1919ce7ed703c5244' 
  AND token = 'FcmUW9TGb64kC3fLaHb5Z77uBXT2WxIx3qS4NOOnoTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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