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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e02b704c087cbc99f5a0c19f198e43b3236ac79bd0886724e5ba2522ee1705' 
  AND token = 'tikay0DxJ6A9yPZ1Q+qjsxGriZP/SgAf7MBL5c46hTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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