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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '966243e41d4178d0c96504dbf625c2a04806569422b21affca364ea14293ef90' 
  AND token = '8FL5Jx5GcrZgjsbMea1GugCn1KwV9umU39lQsZnhce4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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