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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aa38f554a3947160427a430c013ef4b64f84a6af3735b4004b721aadb24b5be' 
  AND token = 'RZ3iGaoUUF23UyXn+eHQSFXxy0UTM+0JxHquVhiC9Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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