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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cdc0a3e6cc9ee2fc93367230a179826b977fe33adff70945c9a85697506e02f' 
  AND token = 'i3Qo7Pu7KqiuF1uzi4+7Uowd3/fh9a5/iqHq4G8BnW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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