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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb7f2c87f85501776bc3053c2bdbab886b51a95586a28b2200ec70d91fa97b8f' 
  AND token = 'qeSV17FXmztzn/Tl23G5fGFIwTiUAYW5scge2aNZpW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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