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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99d38a4e9603e86d2d03962f4daf11f5a4f132226a7723d0cd72a6aefb07499' 
  AND token = 'Ord0iRNAgfltSk2qzDD0d42ZQFAIYK58mUE0z79TKiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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