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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c92e697fcb798ad799bc7cd43f13b7b4bc283c0548d7358e9538b212f129acc9' 
  AND token = 'LLuC+V5UP1eEE/riyg18+PDGdKuxeqHHax04LAl2584=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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