Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3485d6c19ed6b0d7be6961186431065f7f3e6b3409882f0512ddeed32190b35' 
  AND token = 'kQi/Wufqc+PEWuglWGyTNtbtZwzWv00zk7nRu1p6Fqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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