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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd15f2b88706069517fc9cd125f1d019f03548aa2044c161dd2d98782d5d88f06' 
  AND token = 'SX5F7WcVYeKRdjtf6IlVbDsuq8Avn6dhtY/SYaBaw3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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