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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f2d6197f8c53141ddeda57c040da62a4850e99ae9389e994c1a591341f694db' 
  AND token = 'S7/oMBYE5FxVMu2NZF6yNYpYTXsrYOPQQIv5YDj+wFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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