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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a4f3578df5c34b2f912e44f1224647aabea43f7af71e1a75c388f690c0b5e40' 
  AND token = 'yTzzdkqZASXcxes4A3GvtF50Xw0DB2e2nKJGIZKETtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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