Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '314977d4899136b53e91e95b68110651031311d0ba0923f4da6efb697e4709fa' 
  AND token = 'yUgC3BQbRismYiTFKfCIBzO+aPvPAcgoAHR1xbtc7BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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