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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cfa954abc317e85b6f8f1a7a91a306460a555ae1a938b7700876749eceaed1c' 
  AND token = 'fpy/JhWKx6Sx91uQERr/gYh/vAqqL1QD4RBTB75eeJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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