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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dfd9f05cdff491748c29db968de75a4fef743a24c75366643342b7d704360c9' 
  AND token = 'hBvVXeBvNX8f5M7a92EDa9pANB9/4p/r5ZHvajmvGmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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