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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2906ea6a652c84d145b0eae94979bfae92c75d5cb1872f6c9c372db8fc7d7bd' 
  AND token = 'rAczcANqzT95wK/mWk0hV9xzeoj49M9mcGRV37DxG/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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