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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef86d63c3ea9b823624465b2ce936840af19c76a69007042a107c670e055a95f' 
  AND token = 'UOy8zs8PxHyrSy4EqtCDTDQzH2fGgvN/BcbjnWWYBYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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