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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bced2808130b95b9a0a7ddf33a1a270f511b36f36074ec95dcd71fc3b153e30' 
  AND token = 'FFaq6HDijSCOWQ2X/xfrxHWVEDWRAbF3AMNvRzGpckg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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