Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51d13b08d35a0cfea5a7b76fa70fc452e96e9be5391682930cc08520822ec1ea' 
  AND token = 'BTjSTFMzBtZFiwTOC/jo7vew/kxV5XzLDjc2yvzQThQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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