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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3bbcef1917c98fe869e3cd305b4d404d123433e9df1a185dd9dce19dc112033' 
  AND token = 'PE0hj8WtueycD7vuLUE0pqkk4fI9W8gmg/UXU9McXsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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