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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4928263ba15215cce9f37a5da28510428430126e04ce70f4acb30acace3ec62' 
  AND token = '1iGz5FHf+QBznu2uHEFoT64KyjbPjOtbZy7UBL6O8NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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