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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b9ce40d9a77606bad405cde96c1bc4fa339c5e4c2b8c2d81449297eca269a4' 
  AND token = 'IJ7wpLgHWNX6xb2SsjTQz2b1alxnCcIzM8pZZ2I9JJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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