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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfac051c4c48ebb3ec0f421118f52201596c7496c9cda53e6fed7d92d351b873' 
  AND token = 'cP25fjgVva8T5DoWA7JQwXrguUyQuHvaTW/AJJrN6es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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