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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9067b24d4c7890455e8da9983decac8a1b0790f38fcba11e78e09d16e707f337' 
  AND token = 'JgP/PcwvcWeg4YSO/pqqldV6d9yYrjN1kUl5S3WsaeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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