SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8851966d7d4ecad900bc571f81215132eb9cafd43494fc1ff78667f80ffb3da8' 
  AND token = '133s5EZxuT3P/vpEGBGhDeFGuIQEzlnSq/7+ZrZ/7Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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