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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c8f177c041f91f62ad851cd53933929e77ffd3fd84ae2595ccfc1b534e1892a' 
  AND token = '/Xgb2pAUhotyjKp3/0fKQzTYTBbtE0CKrnk65fD/D3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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