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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0196c6094c1ffc59bf1f12073b7604d082eb5ea5443062690703317c8d1b0c9d' 
  AND token = 'N5eQJky5CeCcNMEfHc2BNtRTuJhIjejV/Da9uzsS3/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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