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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b70c29477ae911095ec039a8ecf1a5c5c07687b85ea388e319b9f3fefc6e7df' 
  AND token = 'jdiPwJk/piSQxUaQl2chJaJiA34PLEj1ndf6Qu7nxSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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