Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd81cbe5149584e7dd0bd3e0891c388b7477967514e891d244ef8275997c928af' 
  AND token = 'ESXL1Sl7HU3+HOs3V4cyv1EczTsHpAdO4+zckeh83OY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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