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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f209118ffcb0cb820ac198d2163f2b91b31ade8973644db313d62b9fe6a1a1f4' 
  AND token = 'WLmid+5ZuTo/03tBjiO9J8EcABuMIy19E6EzKRk1Q8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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