Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '620a92b7d3093fa4b48021d6e01c8f662bd06dde16a7a5a8b496e9ff8bd16358' 
  AND token = 'iM0NGRex7lZ1tiFccK153k/nKLBprSbQSTJtY0VNS7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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