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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93f1201d7a77f6b00375a7a71b27642c990cdc082c6a50c9eab907c66433eb36' 
  AND token = 'D97xYU3wyydhc03y2o7D7i+D3cG05Lg5dLGwlP01rqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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