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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58148923eb1e3853ebd122839d5c2d87a5897b8a3d315066f1e3387658e2254b' 
  AND token = '/354nvryvnL7XpSkcOlIDwg1YQLEKAqFQJFPKfLL04U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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