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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a279c0ae635ef0e3205170ed16c0469c656ec822822b2735df160fefd1c86c5f' 
  AND token = 'V6qIg3C1/Yd6IR2STpzg+oN3Gjj9JT6Cwgn70fZ50Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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